Although I have no difficulty centering a horizontal HV Menu in IE, some pages display in Mozilla 1.7 with the menu bar skewed maybe 10 pixels to the right of the rest of the page content. My testing shows that the amount of content on the page affects this. If there isn't much content

http://www.formsprint.com/html/contactus_04.htm

the menu centers with the rest of the page. After a certain point, though, the extra content causes the menu to be skewed slightly.